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West Coast Differentials has been distributing quality differential and axle parts since 1982. We believe that our exceptional customer service and product knowledge is what sets us apart from the competition. Give us a try, we think you'll be glad you did!

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The most current parts and application information can always be found here on our website or by calling one of our differential parts experts. All of the parts we sell are also used every day in our busy service shop. This gives us confidence in the quality of the parts we sell.

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Tag: Limited Slip

The Ford 9 Detroit Truetrac 35 Spline is perfect for use in Ford 9″ axle applications that are being upgraded from 28 or 31 spline to 35 spline.

This unit is also ideal for custom powertrain builds. The 5-pinion design of the Ford 9 Detroit Truetrac provides incredible strength, smooth maintenance-free performance and proven durability. Available NOW!! Call the differential experts at West Coast Differentials for more information. Representatives are available to help Monday thru Friday from 8am to 5pm Pacific Standard Time.

Eaton Performance Products has announced the new Detroit Truetrac for AAM 10.5″ (GM 14-Bolt) Differentials!

This differential is commonly found in 3/4 and 1-Ton GM Trucks and commercial vans.The proven helical gear design of the Detroit Truetrac eliminates the need for wearable parts, resulting in maintenance free traction recognized not only for its toughness, but its smooth and quiet operation as well. Proven design, low cost and effective performance all make the Detroit Truetrac limited slip differential the ideal choice for a wide variety of vehicle applications. No maintenance – Just Traction!

Gear & Axle Package Deals

Are you planning a complete axle build and need Gears, Axles, Kits and a Traction Device? Let us put a package deal together for you! Our packages give you substantial savings over buying parts individually. The following is an example of one of our past package deals…

Jeep JK Gear Packages Ring and Pinion, Lockers Axles & More.

Ring & Pinion Gear Package:

Get the Right Differential Gear Ratio at the Right Price!

Our Jeep JK Gear Packages start as low as $499.00*
Matching ratio Front and Rear Ring and Pinion sets, complete with Mini Install kits (ideal for low-mileage gear ratio changes). This package comes complete with a 2-Year Warranty and is available in 4.56, 4.88 and 5.13 gear ratios for Non-Rubicon Models (5.38 is also available for Rubicon Models)

Gear Package Upgrades

Add Locking Differentials, Limited Slip Differentials or Chromoly Axles to your JK Gear Package and . We have lots of options available. If you don’t see what you’re looking for, give us a call!

Auburn Gear HIGH PERFORMANCE SERIES (HP) Limited-Slip Differentials:

Auburn Gear’s flagship limited-slip differential gives you smooth torque-sensing operation with the correct bias ratios to out perform the competition.

Auburn Gear PRO SERIES Limited-Slip Differentials:

Turns your torque up another notch, offering an even higher bias ratio and faster sensing reaction than HP for the very best in controlled power transfer.

Auburn Gear RACE SERIES Limited-Slip Differentials:

High Performance limited-slip differential specifically for road racing—a differential case designed to allow the center pin to float along with the axle shafts.
This design feature aids the driver when cornering, so that when the driver is turning, the outside wheel axle shaft will apply a force to the center pin, hence, the pinion gears will firmly seat the inside cone/side gear assembly giving the racer an extremely “tight” rear axle. The greater the G-force the more bite you get! If you are an avid road racer you’ll want this unit.

Most Auburn ECTED Max models offer both “limited-slip” and “locker” modes. Some of the newer units switch from “Open” to “Lock”

An on/off switch is mounted near the driver. In the “off” position it operates in limited-slip mode. When the “on” position is selected, the differential operates as a solid axle assembly – the spool/locker performance you desire at the strip or off-road.ECTED Max™ Advantages:

ECTED Max gearing is made from aircraft quality, 9310 heat-treated billet steel to make it as tough as nails!

ECTED Max can be switched on or off “on the fly,” at any road speed.

ECTED Max does not have any shift forks or pins that must be lined up to obtain locker mode.

ECTED Max is quiet – say good-bye to noisy lockers!

ECTED Max is backed by an industry-leading one-year warranty, just like all Auburn Gear Performance Differentials.

Eaton’s Detroit Truetrac was the first helical gear differential ever introduced into the automotive aftermarket.

The Detroit Truetrac remains the leading gear-type limited slip differential in the industry.

Detroit Truetrac’s proven design eliminates the need for wearable parts, resulting in maintenance free traction. Recognized not only for its durability but also it’s smooth and quiet operation. Engineered to work efficiently in front and rear axles, semi-floating (C-clip axles) and transfer cases. Power transfer is so smooth, it literally goes unnoticed by the driver – even in front wheel drive axles.

Proven design and effective performance, all make the Detroit Truetrac limited slip differential the ideal choice for a wide variety of vehicle applications.

(800)375-6849

We stock the entire line of Eaton Performance Differentials, including the Detroit Locker®, Eaton ELocker®, Detroit Truetrac® and Eaton Posi™. To see the entire lineup including technical information, application information and service kits, go to theEaton Performance Application Guide

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We Make the Difference

At West Coast Differentials we are committed to making your experience with us totally enjoyable. We think top-notch customer service is the most important thing we do. By asking ourselves what makes us different than other companies, our answer is that we deliver the level of customer service that other companies only promise.